Email Deliverability Tester

The deliverability tester runs 12 checks across four categories. Authentication (4): SPF alignment, DKIM signature verification, DMARC policy enforcement, and BIMI brand logo presence. Reputation (3): reverse DNS (PTR record), blacklist status across major DNSBLs, and sender MX record validation. Content and Headers (4): List-Unsubscribe header for Gmail and Yahoo compliance, multipart MIME (HTML plus plain text), subject line analysis for spam triggers, and Message-ID format per RFC 5322. Security (1): TLS encryption during transit. You also get a composite spam score based on hundreds of content and header rules.

A spam score of 0.0 is perfect -- it means no rules were triggered and your email looks completely clean. Anything below 5.0 is generally safe and should reach the inbox on most providers. A score of 5.0 or higher crosses the spam threshold, meaning your email would likely be flagged as spam. If your score is between 1.0 and 4.9, review the specific rule hits to see what is adding points and whether you can fix it. Common culprits include missing authentication, HTML-only emails without a plain text part, and overly promotional language.

BIMI (Brand Indicators for Message Identification) is a relatively new standard that displays your brand logo next to your emails in supporting inboxes like Gmail and Apple Mail. It requires a published BIMI DNS record, a DMARC policy set to quarantine or reject, and usually a Verified Mark Certificate (VMC) from DigiCert or Entrust. Most domains do not have BIMI configured yet, so a warning here is normal and will not hurt your deliverability. It is more of a branding enhancement than a deliverability requirement.

Yes. Generate a test address, paste it into your ESP as a recipient (or add it to a test segment), and send your campaign or test email through the platform. The tool will analyze the email exactly as it arrives -- including all the authentication headers, sending IP reputation, and content formatting that your ESP applies. This is one of the best ways to verify that your ESP is properly authenticating on your behalf and that your templates are not triggering spam filters.

The Spam Word Checker analyzes the text content of your email against a database of 500+ known trigger words. It is a content-only tool -- you paste in your copy and get results instantly. The Deliverability Tester is an infrastructure test. It requires you to actually send an email through your mail server or ESP, and it checks everything the receiving server sees: authentication records (SPF, DKIM, DMARC), sending IP reputation, blacklist status, header compliance, TLS encryption, and content scoring. Use the Spam Word Checker while writing your email, and the Deliverability Tester once your infrastructure is set up and you are ready to verify the full sending pipeline.

Test emails and results are stored temporarily for analysis and automatically expire after one hour. After that, both the email content and all associated metadata are permanently deleted from our servers. We do not read, share, or use your email content for any purpose other than generating the deliverability report you requested. No account or signup is required for your first test.